Clotting of the middle cerebral artery, angiograms. Angiogram on the right showing the thrombosis (blood clotting) of the left internal carotid artery of a 65-year-old patient due to a vascular accident. The patient presented with disorders on the right side of the body and language disorder. The angiogram on the right taken 45 minutes later shows the use of thrombolytic medication to remove this blood clot in the left Sylvian artery. The scan on the right shows the increase in the flow of blood through the artery.